/* Basic reset and typography */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: Arial, sans-serif;
    line-height: 1.4;
    color: #333;
    max-width: 1000px;
    margin: 0 auto;
    padding: 10px;
    background-color: #f5f5f5;
}

header {
    text-align: center;
    margin-bottom: 20px;
}

h1 {
    color: #2c3e50;
    margin-bottom: 10px;
    font-size: 28px;
}

h2 {
    color: #34495e;
    margin-bottom: 10px;
    font-size: 20px;
}

/* Navigation */
nav {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.tab {
    padding: 10px 20px;
    background-color: #ecf0f1;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
}

.tab:hover {
    background-color: #bdc3c7;
}

.tab.active {
    background-color: #3498db;
    color: white;
}

/* Sections */
.section {
    display: none;
    background-color: white;
    padding: 15px;
    border-radius: 6px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    margin-bottom: 15px;
}

.section.active {
    display: block;
}

/* Forms */
form {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 12px;
    margin-bottom: 15px;
}

form div {
    display: flex;
    flex-direction: column;
    gap: 3px;
}

label {
    font-weight: bold;
    font-size: 14px;
}

input, select, button {
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 14px;
}

input[type="number"] {
    max-width: 120px;
}

button {
    background-color: #3498db;
    color: white;
    border: none;
    cursor: pointer;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #2980b9;
}

/* Lists */
#peopleList, #expensesList, #balancesList, #ledgerList {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.person-item, .expense-item, .balance-item, .ledger-item {
    padding: 10px 12px;
    border: 1px solid #ddd;
    border-radius: 4px;
    background-color: #f9f9f9;
    font-size: 14px;
}

.person-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.balance-item.positive {
    border-left: 5px solid #27ae60;
}

.balance-item.negative {
    border-left: 5px solid #e74c3c;
}

.ledger-item {
    border-left: 5px solid #f39c12;
}

/* Split inputs */
#splitInputs {
    margin-top: 10px;
}

#splitInputs div {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
}

#splitInputs label {
    min-width: 100px;
}

/* Ledger filters */
#ledgerFilters {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 8px;
    margin-bottom: 15px;
    padding: 12px;
    background-color: #f9f9f9;
    border-radius: 4px;
}

#ledgerFilters div {
    display: flex;
    flex-direction: column;
    gap: 3px;
}

#ledgerFilters select, #ledgerFilters input {
    padding: 6px;
    font-size: 13px;
    border: 1px solid #ddd;
    border-radius: 3px;
}

/* Pagination */
#ledgerPagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 15px;
    margin-top: 20px;
    padding: 15px;
}

#ledgerPagination button {
    padding: 8px 16px;
}

#ledgerPagination button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Modal styles */
.modal {
    display: none;
    position: fixed;
    z-index: 1;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.4);
}

.modal-content {
    background-color: #fefefe;
    margin: 15% auto;
    padding: 20px;
    border: 1px solid #888;
    width: 80%;
    max-width: 500px;
    border-radius: 8px;
}

.close {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
}

.close:hover,
.close:focus {
    color: black;
    text-decoration: none;
}

/* Responsive design */
@media (max-width: 768px) {
    nav {
        flex-direction: column;
        align-items: center;
    }

    .tab {
        width: 100%;
        max-width: 200px;
    }

    form {
        gap: 10px;
    }

    .person-item {
        flex-direction: column;
        gap: 10px;
        align-items: flex-start;
    }

    #ledgerFilters {
        flex-direction: column;
    }

    #ledgerPagination {
        flex-direction: column;
        gap: 10px;
    }

    .modal-content {
        width: 95%;
        margin: 20% auto;
    }
}